Misc code polishing edits

[jponge]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.17%. Comparing base (629e16d) to head (67fe9de).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1956      +/-   ##
============================================
+ Coverage     89.04%   89.17%   +0.12%     
- Complexity     3066     3068       +2     
============================================
  Files           409      409              
  Lines         13064    13068       +4     
  Branches       1650     1650              
============================================
+ Hits          11633    11653      +20     
+ Misses          809      803       -6     
+ Partials        622      612      -10     

Files with missing lines	Coverage Δ
...ye/mutiny/operators/multi/builders/NeverMulti.java	100.00% <ø> (ø)
...operators/uni/builders/UniCreateFromPublisher.java	97.29% <ø> (ø)

... and 14 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Copilot]

Pull Request Overview

This PR contains various code polishing edits to improve code quality and modernize syntax. The changes include updating assertion method calls, modernizing string literals, and adding appropriate suppression annotations.

• Updates deprecated assertion method calls to modern equivalents
• Modernizes string concatenation to use text blocks
• Adds unchecked suppression annotations where needed

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
UniJoinTest.java	Adds unchecked suppression annotation to test class
UniOnEventTest.java	Updates deprecated getRootCause() calls to rootCause()
MultiMergeTest.java	Changes lowercase 'l' to uppercase 'L' for long literal
MultiCollectTest.java	Modernizes instanceof pattern with pattern variable
AssertSubscriberTest.java	Converts string concatenation to text blocks
UniOnFailureRetryTest.java	Updates deprecated getCause() call to cause()
CompositeExceptionTest.java	Updates deprecated getCause() calls to cause()
UniCreateFromPublisher.java	Adds unchecked suppression annotation
NeverMulti.java	Adds unchecked suppression annotation

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}